Presentation is loading. Please wait.

Presentation is loading. Please wait.

Prof. Jianxin Zhong (钟建新)

Similar presentations


Presentation on theme: "Prof. Jianxin Zhong (钟建新)"— Presentation transcript:

1 Prof. Jianxin Zhong (钟建新)
武汉物数所理论交叉学术交流系列报告 (第一二五期) Tuning the Surface and Quantum Well States of Topological Insulator Films Prof. Jianxin Zhong (钟建新) 湘潭大学 物理与光电工程学院 2015年09月15日(周二) 下午16:00-17:00 频标楼4楼报告厅 报告人简介: 钟建新,1985年、1989年先后在湘潭大学获学士和硕士学位,1995年获法国Cergy Pontoise大学固体物理博士学位,1992年破格晋升为教授。曾在法国国家科研中心 ( )、德国Chemnitz工业大学和Gottingen马普研究所( )、美国橡树岭国家实验室( )从事研究工作。1996年入选新世纪百千万人才工程国家级人选,2006年获教育部长江学者特聘教授。目前担任湘潭大学物理与光电工程学院院长、微纳能源材料与器件湖南省重点实验室主任、美国橡树岭国家实验室杰出访问科学家,是教育部创新团队、湖南省创新群体、湖南省高校科技创新团队、国家教学团队、国家精品课程、湖南省重点学科负责人,担任湖南省物理学会理事长、中国物理学会凝聚态理论与统计物理专业委员会委员、中国物理学会理事。 长期从事凝聚态理论与计算和功能材料物理研究,在低维量子结构掺杂、量子扩散与输运、石墨烯及相关体系物性、拓扑绝缘体表面态调控、无序量子系统、随机矩阵理论应用、二维材料的制备与性能、纳米结构能源材料等方面发表论文200余篇,出版著作1部。曾获湖南省自然科学一等奖、全国模范教师、国家教学名师、政府特殊津贴专家等奖励和荣誉。 Abstract: In this talk, I will introduce our recent progress on tuning the surface states of ultra-thin topological insulator films. Using first-principles methods, we explain the puzzling band-topology difference between Sb2Se3 and Bi2Se3 and propose an approach to tuning the topological phase by strain [1]. We demonstrate that Sb2Se3 can be converted into a topological insulator by applying compressive strain while the tensile strain can turn Bi2Se3 into a normal insulator. I will also show that the separation distance between quintuple layers (QL) in ultra-thin Bi2Se3 and Bi2Te3 films have a large increase after relaxation, leading to gap-opening at the surface Dirac cone, in good agreement with the experimental observation [2]. I will further show that Pb adlayers on Bi2Se3 result in splitting of the Dirac cones and large Rashba spin splitting of the quantum well states [3]. Most importantly, the quantum size effect of Pb adlayers leads to an oscillatory behavior of the Rashba splitting. Finally, the effects of electric tuning of the surface and quantum well states in Bi2Se3 films will be discussed [4]. [1].W. L. Liu et al., Phys. Rev. B 84 , (2011). [2].W. L. Liu et al., Phys. Rev. B 87, (2013). [3].H. Yang et al., Phys. Rev. B 86, (2012) [4].H. Yang et al., J. Phys.: Condens. Matt. 26, (2014). 主办单位:武汉物数所理论与交叉研究部


Download ppt "Prof. Jianxin Zhong (钟建新)"

Similar presentations


Ads by Google